<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="/index">
        username: <input name="username" type="text"><br>
        password: <input name="password" type="password"><br>
        <input name="submit" type="submit" value="submit"><br>
    </form>
</body>
</html>